Income Taxes - Unrecognized benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Income Taxes
Unrecognized Tax Benefits	$ 5,942	$ 6,244	$ 6,244	$ 2,537	$ 5,942	$ 6,244
Unrecognized tax benefits that if recognized, would impact the tax expense and effective tax rate	2,300	4,200	4,400
Unrecognized tax benefits cumulative interest and penalties recorded				$ 0	$ 0	$ 0
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at the beginning of the period	5,942	6,244
Additions for tax positions of the current year	294	168
Additions for tax positions of prior years	700	16
Lapse of statute of limitations	(4,399)	(486)
Balance at the end of the period	$ 2,537	$ 5,942	$ 6,244